well i just pulled my head off since i had low compression i was at 90. 100 is what noss says for my elevation. but what im wondering is boring and hone really a necessity cylinders were smooth no scratches or anything. pistons dont look to bad still stock. more or less wondering if i should do just ring or wondering what you guys suggest i put a cool head on i ordered not gonna take it out till i do rebuild. just didnt wanna leave it uncovered in winter, but the cool head with 19cc domes did up me to to around 120 only saying around because compression gauge threads are a little bit shorter then plugs any input would be nice thank you.